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纤维布加固无粘结预应力梁抗弯试验研究
引用本文:和超,丁红岩,范世平,单仁亮,张浦阳.纤维布加固无粘结预应力梁抗弯试验研究[J].天津大学学报(自然科学与工程技术版),2012(11):969-975.
作者姓名:和超  丁红岩  范世平  单仁亮  张浦阳
作者单位:天津大学建筑工程学院;天津大学水利工程仿真与安全国家重点实验室;天津大学滨海土木工程结构与安全教育部重点实验室;天地金草田(北京)科技有限公司;中国矿业大学力学与建筑工程学院
摘    要:通过试验对纤维布加固无粘结预应力梁的破坏形态、受力性能、截面应变分布以及挠度变化等进行了研究,主要讨论了加固梁在不同纤维布加固层数、不同加固前预损伤作用和不同加固纤维材料下的性能.试验结果表明:通过粘贴芳纶纤维布、碳纤维布材料都可以有效地提高无粘结预应力梁的受弯极限承载力;当采用多层纤维布加固时,加固梁的受弯极限承载力提高幅度与粘贴纤维布层数的增加呈单调递减的规律;加固前,施加20%、40%对比梁极限承载力预损伤对加固性能影响不大;同层数纤维布加固,芳纶纤维布与碳纤维布加固梁的受力效果相似,受弯极限承载力相近,裂缝开展和刚度变化存在差异.在试验研究的基础上,通过有限元软件ABAQUS进行了模拟计算研究,模拟结果表明,ABAQUS可以真实反映纤维布加固无粘结预应力梁的整个受力过程,模拟值与试验值吻合较好.最后根据试验以及数学模拟中反映出的规律,建立了纤维布加固无粘结预应力梁极限抗弯承载力的实用理论公式,理论计算结果与试验结果符合较好.

关 键 词:芳纶纤维  碳纤维  加固  无粘结预应力混凝土梁  试验研究  有限元分析

Experimental Research on Bending Capacity of Concrete Beams Prestressed with Unbounded Tendons Strengthened with Fiber Reinforced Polymer
HE Chao,DING Hong-yan,FAN Shi-ping,SHAN Ren-liang,ZHANG Pu-yang.Experimental Research on Bending Capacity of Concrete Beams Prestressed with Unbounded Tendons Strengthened with Fiber Reinforced Polymer[J].Journal of Tianjin University(Science and Technology),2012(11):969-975.
Authors:HE Chao  DING Hong-yan  FAN Shi-ping  SHAN Ren-liang  ZHANG Pu-yang
Institution:1,3(1.School of Civil Engineering,Tianjin University,Tianjin 300072,China;2.State Key Laboratory of Hydraulic Engineering Simulation and Safety,Tianjin University,Tianjin 300072,China;3.Key Laboratory of Coast Civil Structure Safety of Ministry of Education,Tianjin University,Tianjin 300072,China;4.Tian Di JCT(Beijing)Science and Technology Company Limited,Beijing 100013,China;5.School of Mechanics and Civil Engineering,China University of Mining and Technology,Beijing 100083,China)
Abstract:Experimental research on damage morphology, mechanical properties, cross section strain distribution and deflection variation of the concrete beams prestressed with unbounded tendons that were strengthened with fiber rein forced polymer (FRP) was carried out, and the behaviors of reinforced concrete beams with different FRP numbers of layer, different pre-injuries before reinforcement and different fiber reinforced materials were mainly discussed. The experimental results show that both AFRP and CFRP can effectively improve ultimate fiexural capacity of con crete beams prestressed with unbounded tendons; when using multilayer FRP, reinforced beam ultimate flexural capacity monotonically decreases with the increase of FRP layer number; before the reinforcement, when applying 20% and 40% contrast beams of pre-injury, the ultimate flexural capacity on the performance of reinforcement is not obvious; with the same number of FRP layers, the ultimate flexural capacity and stress effect of strengthened beams with aramid fiber reinforced polymer (AFRP) and carbon fiber reinforced polymer (CFRP) are similar, hut the ~rnekdevelopment and change of stiffness are different. Based on the experiment, the results of concrete beams prestressed with unbounded tendons strengthened with FRP were accurately simulated through the finite element software ABAQUS, and the simulated and experimental results are similar. Finally, according to the analysis of test and nu- merical results, the theoretical and practical formula for calculating the ultimate flexural capacity of concrete beams prestressed with unbounded tendons strengthened with FRP was established. The results show that the theoretical cal- culation is in accordance with the experimental data.
Keywords:aramid fiber reinforced polymer(AFRP)  carbon fiber reinforced ploymer(CFRP)  strengthening  concrete beams prestressed with unbounded tendons  experimental study  finite element analysis
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